Calculators
Percent Change Calculator
- Browser-based
- No signup
This percent change calculator automatically shows whether values rose or fell and by what percentage. Enter before and after amounts for prices, metrics, grades, or weights.
Percent change is not symmetric—a 50% increase followed by a 50% decrease does not return to the start.
100% Client-Side
Your data never leaves your computer.
How to use this tool
Enter the earlier value and the later value. Read signed percent change and absolute difference.
Worked example
Example: 75 to 90 is a +20% change; 90 to 75 is a −16.67% change (relative to each starting point).
When to use this
- Month-over-month KPI reporting.
- Before/after experiment results.
- Price history comparisons.
Common examples
- What is 15% of 200? → 30 (discount or tip on a subtotal).
- 45 is what percent of 180? → 25% (test score or completion rate).
- Price rose from $80 to $100 → 25% percent increase.
- Sale price $89 with 30% off → $62.30 before tax.
- Team finished 18 of 24 tasks → 75% completion for status report.
What people search for
Common mistakes
- Swapping before and after values.
- Averaging two percent changes incorrectly.
- Using ending value as denominator.
Related long-tail tasks
- percent change to basis points
- reverse percent change
- annualize monthly percent change
How it works
Choose a percentage mode, enter the values, and calculate. Modes cover finding a percent of a number, reverse percentage, percent change, and increase or decrease by a percent. All math runs in your browser.
Limitations
Handles common percentage math only. Rounding differences may appear when chaining multiple percentage operations.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Related Percentage Calculator guides
These pages use the same percentage calculator with guides tailored to specific search intents.
Frequently asked questions
Increase or decrease?
The sign indicates direction; magnitude is the percent change.
Same as percent difference?
Often used interchangeably for two-value comparisons.
Zero original value?
Percent change is undefined when the original is 0.
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